Tread portion of an automobile tire



FIG. 1 is a perspective view of a tread portion of an automobile tire;

FIG. 2 is a front view thereof;

FIG. 3 is a plane view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a fragmentary enlarged view showing the details thereof; and,

FIG. 7 is an end view taken along line A-A in FIG. 6.

The broken line showing of the tire is for the purpose of illustrating environmental structure and forms no part of the claimed design. 

The ornamental design for a tread portion of an automobile tire, as shown and described. 